Oil India Limited is an Indian public sector company engaged in the exploration, development and production of crude oil and natural gas, transportation of crude oil, and production of liquid petroleum gas. The Ministry of Petroleum and Natural Gas oversees its operations. Headquartered in Duliajan, Assam, the company has its offices in Duliajan, Noida, Kolkata, Guwahati and Jodhpur. The company's history spans the discovery of crude oil in India in the year 1889, this was second in the World in the far east of India at Digboi and Naharkatiya, Assam to its present status as a fully integrated upstream petroleum company, operating in more than 9 locations overseas. OIL acquired majority shares in Numaligarh Refinery Limited from Bharat Petroleum Corporation Limited, thus making Numaligarh Refinery Limited a subsidiary of OIL. In 2023, Oil India Limited was elevated to the Maharatna status on the recommendation of the Ministry of Finance, making it the 13th Maharatna Central Public Sector Enterprises. Wikipedia